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The first part is correct but it can be shortened in working in a diagram form alternatively.

        B               R          G

        3            <–5units–>     (x 3 to make them equal = 15 units)

x3 =9u             7u          8u            (total = 24u)

                      <–15units->

So 9u-7u = 32 => u = 16

24u =384,  8u = 128

Alternative Solution for part 2:

Let p be the added green pens

(128+p)/(383+p) = 68/100

12800 + 100p = 26112 + 68p

32p =13312   => p =416

Hence number of green pens added is 416.

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Continue with

Blue: 9 units: 16 * 9 = 144 pens
Red: 7 units: 16* 7 = 112 pens
Green: 8 units: 16*8 = 128 pens

112 +144 = 256pen (B + R) = 100% -68% = 32%
32% are B+R pens = 256 pens
68% = 544 green pens

544-128 = 416 (green pens added)

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